APA aipamena

Birdsall, S. S., & Stephen S. Birdsall. (1998). An: Regional landscapes of the United States. [Washington, D.C: U.S. Dept. of State, International Information Programs.

Chicago Style aipamena

Birdsall, Stephen S., và Stephen S. Birdsall. An: Regional Landscapes of the United States. [Washington, D.C: U.S. Dept. of State, International Information Programs, 1998.

MLA aipamena

Birdsall, Stephen S., và Stephen S. Birdsall. An: Regional Landscapes of the United States. [Washington, D.C: U.S. Dept. of State, International Information Programs, 1998.